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Unix Shell Script

Unix Shell Script. 2003/03/24 For SPARCS ’03 김군훈 <airlover@sparcs.kaist>. Index. What is shell? Shell configuration & Environment variable. Standard input/output/error, Redirection, Pipelining. Shell script examples. Shell script syntax. Special parameter Making shell. Homework. User.

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Unix Shell Script

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  1. Unix Shell Script 2003/03/24 For SPARCS ’03 김군훈<airlover@sparcs.kaist>

  2. Index • What is shell? • Shell configuration & Environment variable. • Standard input/output/error,Redirection, Pipelining. • Shell script examples. • Shell script syntax. • Special parameter • Making shell. • Homework.

  3. User What is shell? • Command / Interpreter • Bourn Shell • C Shell • Korn Shell • Bash • Tcsh Program Shell Kernel Program Program

  4. Bash Configuration • .bash_login: Login initialization like .login • .bash_logout: Logout actions • .bashrc: Shell configuration • .bash_profile: Login shell configuration • .inputrc: Individual readline initialization file • .bash_history: Command history file

  5. Environment Variable. • PWD • Current working directory. • PATH • The search path. • PS1 • The primary prompt string. • MAIL • Filename to check mail. Shell Var. - set export Environ. Var. - env

  6. 0 - STDIN 0 - STDIN 1 - STDOUT 1 - STDOUT 2 – STDERR 2 – STDERR : : : : : : Standard input, output, error Program2 FD Program1 FD

  7. File File Program Program Redirection & Pipelining < > | Etc.. >> << <<< 2>&1 2> &>…

  8. Script Examples - Start #!/bin/sh mutt telnet ara telnet ska telnet pie

  9. Script Examples(2) – Color Table #!/usr/local/bin/bash esc="\033[" echo -e " 40 41 42 43 44 45 46 47" for fore in 30 31 32 33 34 35 36 37; do line1="$fore " line2=" " for back in 40 41 42 43 44 45 46 47; do line1="${line1}${esc}${back};${fore}m 보통 ${esc}0m " line2="${line2}${esc}${back};${fore};1m 밝은 ${esc}0m " done echo -e "$line1\n$line2" done

  10. Script Examples(3) – Dictionary $ sh eng_dic shell shell [LINK] 발음듣기 [INLINE] shell [ [INLINE] 雩] n. 1 a 조가비(seashell); (굴의) 껍질 b (거북 [INLINE] 새우 [INLINE] 게 등의) 등딱지, 껍데기 c (콩의) 깍지, 꼬투리 d 시초(翅?), 딱지 날개 e (번데기의) 외피 f (과일 [INLINE] 종자 등의) 껍질; [ pl. ] 카카오 껍질(cacao shells) #!/bin/sh WORD=$* WORD=$(echo ${WORD} |od -tx1 -w1000 |head -1 \ |sed -e 's/^[0-9]\+ //' -e 's/ 0a$//' -e 's/20/+/g' -e 's/ /%/g' -e 's/^/%/' \ |tr '[a-z]' '[A-Z]') lynx -nolist -verbose -dump http://kr.engdic.yahoo.com/result.html?p=${WORD} \ |grep -v "bu2.gif" |tail +14 |tac |tail +11 |tac \ |sed -e 's/[phon[0-9]\+\.gif] //g' -e 's/[phon[0-9]\+\.gif]//g' \ |less -r

  11. Script Examples(4) – Etc. • Automatic install program. • Homework submit program. • Homework num., source file • Delay due • Homework marking program. • Compare optimized solution • Check execution time. • Check empty IP address.

  12. Shell script syntax - for • for name [ in word ] ; do list ; done #!/usr/local/bin/bash for ((i=102;i<151;i++)); do data=`nslookup 143.248.234.$i 2> /dev/null| tail +4|head -1`; echo $i $data; done; 102 Name: sparcs.kaist.ac.kr 103 Name: ara.kaist.ac.kr 104 Name: baram.kaist.ac.kr 105 Name: gurum.kaist.ac.kr 106 Name: sparcs6.kaist.ac.kr 107 Name: sparcs7.kaist.ac.kr 108 Name: sparcs8.kaist.ac.kr 109 Name: sparcs9.kaist.ac.kr 110 Name: ftp.kaist.ac.kr . . . . . . . . . . . . . . . .

  13. Shell script syntax(2) - if • if list; then list; [ elif list; then list; ] ... [ else list; ] fi #!/bin/sh echo $1; echo $2; if [ "$1" = "$2" ]; then echo "It's same"; else echo "It's different"; fi $ ./diff abc abc abc abc It’s same $ ./diff abcc abcd abcc Abcd It’s different

  14. Shell script syntax(3) – select • select name [ in word ] ; do list ; done #!/usr/local/bin/bash OPTIONS="Hello Quit" select opt in $OPTIONS; do if [ "$opt" = "Quit" ]; then echo done exit elif [ "$opt" = "Hello" ]; then echo Hello World else clear echo bad option fi done 1) Hello 2) Quit #? 1 Hello World #? 2 done

  15. Shell script syntax(4) - case • case word in [ [(] pattern [ | pattern ] ... ) list ;; ] ... esac #!/bin/sh case $1 in all) telnet ara; telnet ska; telnet noah;; a) telnet aka;; s) telnet ska;; n) telnet noah;; esac

  16. Shell script syntax(5) – Etc. • while list; do list; done • until list; do list; done • [ function ] name () { list; }

  17. Special Parameters • 0 : Name of the shell or shell script • $ : Process ID of the this shell • ! : Process ID of last background command • # : Number of arguments • @ : Positional parameter • 1, 2, 3, .. 9 : n-th argument

  18. Making Shell • 2003 SP Seminar on summer vacation • For studying system programming. • For being a SPARCS man. • A flower of circle activation. • SP + ARCS = SPARCS

  19. Homework • airlover라는 폴더를 만든다. • 위에서 만든 폴더에 이름이 SPARCS 03학번 회원들의 아이디인 파일을 만들고 그 회원이 마지막으로 접속한 시각을 기록한다. • 하나의 파일로 묶은 후 압축해서 airlover.tar.bz2라는 파일로 만든다. • airlover폴더를 지운다. • 실행하면 자동으로 압축이 풀리게 만든다. • c.f) /SPARCS/mail/aliases.d/sparcs2003

  20. Reference • http://kldp.org/HOWTO/html/Adv-Bash-Scr-HOWTO/index.html • Sh/Bash/Csh/Tcsh man pages

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